JP2011211001A - Magnetization coil and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetization coil, which prevents a magnetic pole deviation caused by magnetization, and can be readily manufactured.SOLUTION: A magnetization coil is used to produce a multipolar-magnetized cylindrical bonded magnet, wherein N poles and S poles are arranged alternately in an axial direction. The magnetization coil is composed of a laminated body, wherein multiple metal plates each, having a cutout extending from the circumference to the center thereof, and multiple insulating boards are alternately laminated so that each segment has a width determined by the distance between magnetic poles of the cylindrical bonded magnet to be magnetized. The upper end of the cutout in each metal plate is electrically connected to the upper ends of the cutouts in other metal plates adjacent to the metal plate with an insulating board interposed therebetween; the metal plates and the insulating boards have, respectively in their centers, a through-hole that has a diameter allowing the insertion of the cylindrical binded magnet; and a portion of the through-hole is connected to the cutouts. It is preferable that the inner wall surface of the through-hole in the metal plates be in contact with the side surface of the cylindrical binded magnet.

Description

  The present invention relates to a magnetizing coil for magnetizing a cylindrical bonded magnet in which N poles and S poles are alternately multipolar magnetized in the axial direction, and a method of manufacturing the same.

  As a foreign substance removing device for removing iron powder from food and a magnet used as a stator or mover of a shaft motor, there is a cylindrical bonded magnet in which N poles and S poles are alternately magnetized in the axial direction. In order to magnetize such a cylindrical bonded magnet, for example, as disclosed in Patent Document 1, it is composed of a coil formed by alternately winding thin metal wires in the forward direction and the reverse direction. A magnetized coil has been needed.

  As a method for manufacturing such a magnetized coil, for example, as shown in FIG. 2, a plurality of coils 102 wound in advance are passed through a hollow core 104 made of an insulating material such as bakelite, and the positive direction. And the coil wound in the opposite direction are alternately placed side by side. There is a method in which an insulating partition wall 103 made of bakelite is sandwiched between the coils, and then both ends of each coil are electrically connected one by one to form a magnetized coil.

JP-A-6-69034

  However, when producing a magnetized coil as shown in FIG. 2, when winding a thin metal wire a plurality of times, the fine metal wires overlap each other or the distance between the fine metal wires varies, so that the fine metal wire and another fine metal wire A slight misalignment occurs in the position. In particular, a deviation in the direction corresponding to the axial direction of the cylindrical bond magnet causes a magnetic pole deviation of the cylindrical bond magnet during magnetization. This magnetic pole deviation becomes a factor that the positioning accuracy is lowered when a cylindrical bonded magnet is used in a shaft motor. For this reason, the cylindrical bonded magnet needs to have magnetic poles accurately aligned in the axial direction at the same predetermined interval as before magnetization even after magnetization.

  Therefore, the present invention is to solve such problems, and to provide a magnetized coil for a cylindrical bonded magnet that can prevent magnetic pole displacement due to magnetization and can be easily manufactured.

  In order to achieve the above object, a magnetizing coil according to the present invention is a magnetizing coil for magnetizing a cylindrical bonded magnet in which N poles and S poles are alternately magnetized in the axial direction. The magnetic coil is a magnetic pole of a cylindrical bond magnet in which a plurality of metal plates having notches cut out from the peripheral portion to the center portion and an insulating plate material interposed between the metal plates are to be alternately magnetized. The upper end of the notch portion of the metal plate is located at the upper end of the notch portion of another metal plate adjacent to each other through the insulating plate material. The metal plate and the insulating plate material are electrically connected, and have a through hole of a size that allows the cylindrical bonded magnet to be inserted at the center of each of the metal plate and the insulating plate member, and a part of the through hole is cut. It is connected to the notch.

  In the metal plate, the inner wall surface of the through hole is preferably in contact with the side surface of the cylindrical bond magnet.

  The cylindrical bonded magnet preferably has an insulating property. The cylindrical bonded magnet is preferably made of an SmFeN-based magnetic material.

  The magnetizing coil manufacturing method according to the present invention is a magnetizing coil manufacturing method described above, in which a plurality of metal plates and an insulating plate material interposed between the metal plates are stacked to form a laminate. A first step, a second step of forming a notch in the metal plate and the insulating plate by cutting from a part of the side surface of the laminate to the center of the laminate, and the cut A third step of disposing an insulating member in the notch and an upper end of the notch of the metal plate electrically connected to an upper end of the notch of another metal plate adjacent to each other through the insulating plate. A fourth step of connecting to the support, and fixing the laminate to the support so that both ends thereof protrude, and then inserting a through hole into which the cylindrical bond magnet is inserted. Connected to the center of the laminate along the axial direction A fifth step that is characterized by having a.

  The third step preferably includes a step of inserting an insulating plate material into the notch.

  The fourth step preferably includes a step of electrically connecting with solder or a conductive wire.

  Since the magnetized coil of the present invention uses a metal plate having a constant thickness, the magnetic pole shift due to magnetization is reduced as compared with a coil made of a thin metal wire, so that it can be magnetized with excellent positional accuracy. it can.

  In the method for manufacturing a magnetized coil according to the present invention, since the coil is formed of a metal plate instead of the coil made of the thin metal wire, it does not take time to wind the fine metal wire when forming the coil. Therefore, the present invention does not require the work of winding a fine metal wire, and therefore it is easier to manufacture a magnetized coil.

  Moreover, the magnetized coil of this invention can contact | connect the inner wall surface of the magnet insertion hole provided in the metal plate, and the side surface of a cylindrical bond magnet in the state which does not interpose an insulating material. Thereby, the part through which the current flows and the cylindrical bonded magnet are very close. Therefore, since a strong magnetizing magnetic field can be applied to the columnar bonded magnet, the surface magnetic flux density of the magnet after magnetization can be improved.

FIG. 1 is a schematic perspective view of a cylindrical bonded magnet magnetized by the magnetizing coil of the present invention. FIG. 2 is a perspective view schematically showing a structure of a conventional magnetized coil for magnetizing a cylindrical bonded magnet. FIG. 3 is a perspective view showing a state where the magnetized coil of the present invention is disassembled. FIG. 4 is a perspective view showing a magnetized coil manufacturing method according to the present invention. FIG. 5 is a perspective view showing a method of manufacturing a magnetized coil according to the present invention. FIG. 6 is a perspective view showing a magnetized coil manufacturing method according to the present invention. FIG. 7 is a perspective view showing a magnetized coil manufacturing method according to the present invention. FIG. 8 is a perspective view showing a method of manufacturing a magnetized coil according to the present invention. FIG. 9 is a characteristic diagram showing the distribution of magnetic flux density in the axial direction (A-A ′) on the side surface of the cylindrical bonded magnet shown in FIG. 1. FIG. 10 is an enlarged view of a part of the characteristic diagram shown in FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the form shown below illustrates the magnetized coil and its manufacturing method for embodying the technical idea of the present invention, and the present invention limits the magnetized coil and its manufacturing method to the following. It is not a thing.

  Further, the present specification by no means specifies the member shown in the claims as the member of the embodiment. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same name and reference sign indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.

  In a magnetized coil for magnetizing a cylindrical bonded magnet in which N poles and S poles are alternately magnetized in the axial direction, a cylindrical bonded magnet that can be easily manufactured while preventing magnetic pole displacement due to magnetization. In order to provide a magnetized coil for use, the present inventor has intensively studied, and as a result, paid attention to the fact that a metal plate may be used instead of a coil formed by winding a thin metal wire with a normal magnetized coil. The present invention has been completed.

  That is, according to the present invention, a plurality of metal plates having notches from the center portion to the peripheral portion and the insulating plate material separating the metal plates are matched to the width determined by the magnetic pole distance of the cylindrical bond magnet. The upper end of the notch portion of the metal plate is electrically connected to the upper end of the notch portion of the adjacent metal plate, respectively. Furthermore, the present invention has a through-hole (magnet insertion hole) into which a cylindrical bonded magnet can be inserted in the central portion along the axial direction of the laminated body. It is a coil.

  In the metal plate constituting the magnetized coil of the present invention, it is preferable that the inner wall surface of the through hole for inserting a magnet provided at the center thereof is in contact with the side surface of the columnar bonded magnet to be magnetized. Thereby, since the magnetic field formed by the metal plate can be directly applied to the side surface of the cylindrical bond magnet, the cylindrical bond magnet can be magnetized with a high magnetic force. Conventionally, a coil formed by winding a thin metal wire has an insulating material that coats the surface of the thin metal wire. For this reason, the fine metal wires cannot be brought into direct contact with the side surfaces of the cylindrical bonded magnet. Moreover, the operation | work which removes the insulating material which coats the surface of a metal fine wire was complicated. However, according to the metal plate of the present invention, since there is no coating with an insulating material, the inner wall surface of the through hole of the metal plate and the side surface of the cylindrical bond magnet can be brought into direct contact.

  The cylindrical bond magnet to be magnetized is preferably insulating. Since the cylindrical bonded magnet is insulative, the metal plates do not conduct through the cylindrical bonded magnet even when the side surfaces of the cylindrical bonded magnet are in contact with the inner wall of the metal plate magnet insertion hole. . Therefore, the columnar bond magnet can be directly magnetized with the metal plate without requiring another insulating material that avoids conduction through the columnar bond magnet.

  In particular, the insulating columnar bonded magnet is preferably a bonded magnet made of an SmFeN-based magnetic material. Since the SmFeN-based magnetic material has high insulating properties, it can be suitably used.

  The manufacturing method of the magnetized coil concerning this invention includes the process demonstrated below. First, a plurality of metal plates and a plurality of insulating plate materials interposed between the metal plates are alternately stacked to form a cylindrical laminate. The metal plate and the insulating plate material can be selected from various shapes such as a disc shape, an ellipse shape, and a polygonal shape. However, the metal plate and the insulating plate material can be magnetized with a uniform magnetic force in the circumferential direction of the cylindrical bond magnet. Considering this, it is preferable to use a disk shape.

  Next, a part of the side surface of the cylindrical laminated body is cut from the peripheral part to the center part of the cylindrical laminated body to form a groove in a part of the side surface of the cylindrical laminated body. In addition, this groove | channel is formed as a notch part about a metal plate and an insulating board | plate material. Further, in the manufacturing method of the present invention, the notch portion is formed in both the metal plate and the insulating plate material. However, in the magnetized coil of the present invention, it is necessary to provide the notch portion in the insulating plate material. However, if at least a notch is provided in the metal plate, the function as a magnetized coil can be achieved.

  And an insulating member is arrange | positioned in the groove | channel of a laminated body. The insulating member may be arranged by pouring an insulating adhesive into the groove and curing it, or by inserting an insulating plate member that fits into the groove into the groove of the laminate. .

  And the upper end of the notch part of a metal plate is electrically connected to the upper end of the notch part of another adjacent metal plate via an insulating board material, respectively. This electrical connection can be made by solder or a conductive wire.

  Then, the laminate is disposed in a support body having a cavity inside, such as a plastic case having holes provided on both side surfaces facing each other. Then, the laminate is fixed with an insulating adhesive such as a silicone resin or an epoxy resin.

  Finally, it is like a drill along the axial direction of the cylindrical laminate, with a size and shape that allows the cylindrical bond magnet to be inserted at the edge from the both ends of the laminate to the center of the cylindrical laminate. A through-hole is formed by cutting with a simple tool, and this through-hole is used as a magnet insertion hole for inserting a cylindrical bonded magnet. The through holes may be formed in advance before being superimposed on the metal plate and the insulating plate material. However, considering the difficulty in positioning the through holes, the metal plate and It is preferable to form the through holes collectively for the insulating plate material. The through hole is formed along the center of the cylindrical laminate, that is, along the bottom of the groove formed on the side surface of the laminate, and a part of the inner wall surface of the through hole is formed between the metal plate and the insulation. Connected to a notch formed in the sheet material. Thereby, an electric current flows along the periphery of the through-hole of a metal plate, without an electric current flowing through the notch part of a metal plate. The columnar bonded magnet can be magnetized by the magnetic force generated by this current.

  Hereinafter, a magnetized coil and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a columnar bonded magnet that is an object to be magnetized in the present invention. The cylindrical bonded magnet is formed by a single molding process using an injection molding machine. That is, first, a step of filling a compound made of resin and magnetic material into a cavity of an injection molding machine, next, a step of solidifying the resin in the compound while orienting the magnetic material, and finally, a molded body It is formed by the step of taking out the cylindrical bonded magnet from the cavity. Therefore, the cylindrical bonded magnet formed by such injection molding becomes a single molded body without a joint between the magnetic pole and the adjacent magnetic pole.

  An anisotropic or isotropic magnetic powder can be used as the magnetic material. For example, examples of anisotropic magnetic powder include ferrite, SmCo, NdFeB, and SmFeN. Examples of the isotropic magnetic powder include SmCo type and NdFeB type. When it is necessary to form a columnar bonded magnet having a strong magnetic force, it is preferable to use anisotropic magnetic powder, and SmFeN system is particularly preferable in view of moldability. This is because anisotropic magnetic powder is very easily aligned in magnetization direction due to a magnetic field applied during orientation, and as a result, the magnetic force of the cylindrical bond magnet is increased. A material with excellent moldability is also easily oriented. The above magnetic powders can be used singly or in combination of two or more. Moreover, you may perform an oxidation-resistant process and a coupling process as needed.

  FIG. 2 is a perspective view of a state in which a magnetizing coil conventionally used for magnetizing the cylindrical bonded magnet shown in FIG. 1 is disassembled in a direction corresponding to the axial direction of the cylindrical bonded magnet. . In order to produce this magnetized coil, first, two types of coils (right-handed coil and left-handed coil) having different winding directions are produced using a dedicated jig. Next, these are passed through the insulating air core rod 104 in the order of “right-handed coil, insulating plate material, left-handed coil”, and a spacer for determining the width of the coil portion is inserted. Hold the end of the magnetized coil lightly with a vise and pull both ends of the coil to remove the slack of the winding. To do. Finally, this is put in a plastic case, and the whole is enclosed in an epoxy resin and completed.

  This magnetized coil is connected to a magnetizer, and a columnar bond magnet is inserted into the magnet insertion hole of the air core rod 104 and magnetized. However, in this manufacturing method, in a coil constituted by a plurality of wound thin metal wires, a shift in a direction perpendicular to the winding direction of the thin metal wires can be made. Therefore, the direction perpendicular to the winding direction of the thin metal wire corresponds to the axial direction of the cylindrical bond magnet, and the cylindrical bond magnet magnetized with such a coil is before and after magnetization, Deviation of the magnetic poles formed in the axial direction occurs. In addition, it is possible to produce a magnetized coil with little deviation by using a metal thin wire (square wire) having a square cross section. However, as long as the coil is formed by winding a metal thin wire, the magnetic pole is misaligned. End up.

  FIG. 3 is a perspective view of the magnetized coil of the present invention in an exploded state. As shown in FIG. 3, the metal plate 108 constituting the magnetized coil according to the present invention has a cutout portion 105 that is cut out only at one place from the center portion to the peripheral portion of the metal plate 108. The upper end on one side of the portion 105 is connected to the upper end on one side of the notch portion 105 of the adjacent metal plate 108 via an insulating plate 109 with a conductive wire 106. This structure is equivalent to a structure in which the coil is wound in the reverse direction one by one. Unlike the coil in which the thin metal wires are randomly overlapped, the insulating plate 109 and the metal plate 108 are overlapped in a plane. The magnetic pole position accuracy due to magnetization is determined only by this.

  This magnetizing coil is for magnetizing the cylindrical bonded magnet 101 with the same magnetizing pattern as the magnetic pole pattern shown in FIG. A major difference between the conventional magnetized coil and the present invention is that the coil 102 shown in FIG. 2 is changed to a metal plate 108 shown in FIG. Thus, the magnetization interval is determined only by the thickness of the insulating plate material 109 and the metal plate 108. Therefore, compared with the case where a magnetized coil is produced using the coil by a general metal fine wire, a magnetized coil with high magnetization accuracy can be produced easily. That is, unlike a magnetized coil in which a coil is formed by winding a thin metal wire, the present invention can reduce a shift in a direction corresponding to the axial direction of the columnar bonded magnet. Therefore, the present invention can accurately magnetize the cylindrical bond magnet at a pitch determined by the distance between the magnetic poles of the cylindrical bond magnet. Moreover, in the production of the magnetizing coil, the most troublesome work of winding the fine metal wire can be omitted, so that the magnetizing coil can be easily manufactured.

  The metal used for the metal plate 108 may be anything as long as it has a low resistivity, and copper, silver, gold, aluminum and the like are preferable. In particular, copper is preferable in consideration of electrical conductivity.

  As a material of the insulating plate material 109, a material having high insulation, strength, and heat resistance is preferable. For example, it can be selected from thermosetting resins such as phenol resin, melamine resin, epoxy resin, urea resin, alkyd resin, and thermosetting polyimide. Also, porcelain can be used. As a material of the insulating plate material 109, a phenol resin (bakelite) can be particularly preferably used as a material having insulation, strength and heat resistance.

  FIG. 9 is a characteristic diagram showing the distribution of magnetic flux density in the axial direction (A-A ′) of the side surface of the cylindrical bonded magnet 101 shown in FIG. 1. FIG. 10 is an enlarged view of a part of the characteristic diagram shown in FIG. Here, a cylindrical bonded magnet having an inner diameter of 5.0 mm and a length of 30 mm is used (magnetic pole pitch is 5.0 mm), and the vicinity of the center is 15 mm (from the center of the cylindrical bonded magnet in the axial direction). The measurement was performed within a range of 7.5 mm on each of the left and right sides. The cylindrical bonded magnet before magnetization is multipolarly magnetized in the axial direction by the arrangement of the orientation magnets during injection molding. Therefore, when the magnetic flux density is measured along the axial direction, the distribution of the surface magnetic flux becomes a sine curve as shown in FIG. In the case of the cylindrical bonded magnet shown in FIG. 1, the magnetic poles appear at a pitch of 5 mm, and the magnetic flux density becomes zero at a pitch of 5 mm. Therefore, the distribution of the magnetic flux density after magnetization should be in a form along this. However, as shown in FIGS. 9 and 10, “magnetization with the magnetizing coil of the present invention (Example 1), magnetizing with the conventional magnetizing coil (Comparative Example 1), and before magnetization (reference example)”. Comparing the three, in Comparative Example 1 and Reference Example, the magnetic flux density does not become zero at the end of the sine wave, whereas in Example 1, the magnetic flux density becomes zero at the end of the sine wave. Thus, it can be seen that the magnetized coil of the present invention has less magnetic pole misalignment due to magnetization compared to the conventional magnetized coil.

  4 to 8 are views showing a method of manufacturing a magnetized coil according to the present invention. First, as shown in FIG. 4, a plurality of metal plates 110 and a plurality of insulating plate materials 111 are alternately sandwiched to form a cylindrical laminate as shown in FIG. 4. As shown in FIG. 5, after a part of the side surface of the laminate is cut from the peripheral part to the center part to form a groove 112, an insulating plate material 113 as shown in FIG. 5 is inserted into the groove 112. And fix with an insulating adhesive such as epoxy resin. Next, as shown in FIG. 6, the upper end portions of the cutout portions of the metal plate 110 are alternately connected by solder or conductive wires 114. As shown in FIG. 7, it is put in a plastic case which is a support body 115 provided with holes on two opposite side surfaces so that both end faces of a cylindrical laminated body protrude, and the magnetizing coil is prevented from spreading. After the end is lightly sandwiched and fixed with a vise, a filler 117 made of an epoxy resin is sealed in the gap between the plastic case and the laminate so that the entire laminate accommodated in the plastic case is covered. . Finally, as shown in FIG. 7, a magnet insertion hole 118 having a size that allows a cylindrical bonded magnet to be inserted in the center of the laminate is cut with a drill 116, and magnetized as shown in FIG. Complete the coil.

  When manufactured in this manner, the inner surface of the through-hole 118 for inserting the cylindrical bonded magnet is in a state where the metal plate 110 is exposed, and the metal plate 110 is not coated with an insulating material. On the other hand, the magnetized columnar bond magnet is a substantially insulating bond magnet made of an SmFeN-based magnetic material having a high resistivity. Therefore, since the current flowing through the metal plate for magnetization does not flow to the magnet side and short-circuits, the N pole and the S pole can be alternately magnetized, and the laminate of the present invention can be magnetized. Can function as. Further, the smaller the distance between the coil through which the current flows and the columnar bonded magnet that is magnetized, the greater the magnetic field that is magnetized. In the case of the present invention, the metal plate 110 through which a current flows and the cylindrical bond magnet are in direct contact. Therefore, in the magnetized coil of the present invention, the magnetic field applied to the magnet at the time of magnetization is maximized, and the magnetized magnetic field can be strengthened.

  Since the structure of the magnetized coil of the present invention is configured by laminating the metal plates one by one, it is substantially the same as the case of one coil. Therefore, it is required to increase the magnetized magnetic field. This is because the magnitude of the magnetized magnetic field is a value obtained by multiplying the number of turns of the coil and the current value. In the present invention, the strength of the magnetized magnetic field can be increased by reducing the thicknesses of the metal plate 108 and the insulating plate material 109. This is because, for example, when a single metal plate is divided into five pieces, five thin metal plates are connected by one conductive wire, so that five metal plates through which a current flows are connected. This is because it can be increased. In other words, it is equivalent to increasing the number of coils made of fine metal wires from one to five.

  Examples according to the present invention will be described in detail below. Needless to say, the present invention is not limited to the following examples.

(Magnetization with magnetized coil using metal plate)
4 to 8 are diagrams showing a method of manufacturing a magnetized coil according to this embodiment. A copper round bar (C1100) with an inner diameter of 30 mm is used for the metal plate, and a bakelite round bar with an inner diameter of 30 mm is used for the insulating plate material. The copper round bar has a thickness of 3 mm and the bakelite round bar has a thickness of 2 mm ( A magnetized coil constituted by laminating a metal plate and an insulative plate material was fabricated by combining those processed into only 10 mm at both ends.

A cylindrical bonded magnet (magnetic pole pitch is 5.0 mm) having an outer diameter of 5.0 mm and a length of 30 mm is set in the magnet insertion hole of the magnetized coil, and 500 μF according to the orientation. Magnetization was performed by applying a pulse current of 0 kV (12.6 kA). After magnetization, the magnetic flux density in a 15 mm range near the center in the axial direction (AA ′) of the side surface of the cylindrical bonded magnet shown in FIG. 1 was measured.
<Comparative Example 1>
(Magnetization with magnetized coil using coil)
FIG. 2 is a perspective view of a state in which a magnetizing coil conventionally used for magnetizing the cylindrical bonded magnet shown in FIG. 1 is disassembled in a direction corresponding to the axial direction of the cylindrical bonded magnet. . As shown in FIG. 2, a magnetized coil is produced. In this comparative example, a magnetized coil produced using a coil (glass-wrapped copper wire) having a wire diameter of 1 mm was produced. A cylindrical bonded magnet having the same size as in Example 1 was set on this, and magnetized by applying a pulse current of 500 μF and 2.0 kV (6.8 kA) in accordance with the orientation. After magnetization, the magnetic flux density was measured within a range of 15 mm near the center in the axial direction (AA ′) of the side surface of the cylindrical bonded magnet shown in FIG.
<Reference example>
(Cylindrical bonded magnet before magnetization)
Before magnetization, the magnetic flux density was measured within a range of 15 mm in the vicinity of the center in the axial direction (AA ′) of the side surface of the cylindrical bonded magnet having the same size as in Example 1.
(Comparison of surface magnetic flux density)
FIG. 9 is a characteristic diagram showing the distribution of magnetic flux density within a range of 15 mm near the center in the axial direction (AA ′) of the side surface of the cylindrical bonded magnet 101 shown in FIG. 1. FIG. 10 is an enlarged view of a part of the characteristic diagram shown in FIG.

  The surface magnetic flux density distributions of the three columnar bonded magnets of Example 1, Comparative Example 1, and Reference Example were graphed and compared as shown in FIGS. When the enlarged graph of FIG. 10 is seen, the end of the sine wave of the magnetic flux density distribution graph of the columnar bond magnet magnetized using the magnetizing coil of Example 1 according to the present invention is as follows: It is most accurately at the end of the measurement range of the magnetic flux density (when the position scale is 15 mm), that is, at the predetermined position of the magnetic poles at intervals of 5 mm of the cylindrical bonded magnet before magnetization. As a result, it can be seen that the magnetic poles that were scheduled to be magnetized have the least magnetic pole misalignment as a cylindrical bonded magnet with an interval of 5 mm.

  From the above results, the magnetized coil of the present invention can reduce the deviation of magnetic poles due to magnetization.

  The magnetizing coil of the present invention can be used as a magnetizing coil for magnetizing a cylindrical bonded magnet used as a part of a shaft motor.

DESCRIPTION OF SYMBOLS 101 ... Cylindrical bonded magnet, 102 ... Coil, 103 ... Insulating plate material, 104 ... Air core rod, 105, 112 ... Notch part, 106, 114 ... Conductivity Wire, 107, 118 ... Magnet insertion hole, 108, 110 ... Metal plate, 109, 111, 113 ... Insulating plate material, 115 ... Support, 116 ... Drill, 117 ... -Filler.

Claims (7)

In a magnetizing coil for magnetizing a cylindrical bonded magnet in which N and S poles are alternately magnetized in the axial direction,
The magnetizing coil includes a plurality of metal plates each having a notch that is missing from a peripheral portion to a center portion, and an insulating plate interposed between the metal plates. It consists of a layered body with a width determined by the distance between,
The upper end of the notch portion of the metal plate is electrically connected to the upper end of the notch portion of another metal plate adjacent to each other through the insulating plate material,
Each of the metal plate and the insulating plate material has a through hole of a size that allows the cylindrical bonded magnet to be inserted in each center portion, and a part of the through hole is connected to the notch portion. Magnetized coil characterized by.   2. The magnetized coil according to claim 1, wherein the metal plate has an inner wall surface of the through hole in contact with a side surface of the cylindrical bond magnet.   The magnetized coil according to claim 1, wherein the columnar bonded magnet has an insulating property.   The magnetized coil according to any one of claims 1 to 3, wherein the cylindrical bonded magnet is made of an SmFeN-based magnetic material. A method for manufacturing a magnetized coil according to any one of claims 1 to 4,
A first step of forming a laminate by stacking a plurality of metal plates and an insulating plate material interposed between the metal plates;
A second step of forming a notch in the metal plate and the insulating plate material by cutting from a part of the side surface of the laminate to the center of the laminate;
A third step of disposing an insulating member in the notch,
A fourth step of electrically connecting the upper end of the notch portion of the metal plate to the upper end of a notch portion of another metal plate adjacent to each other via the insulating plate material;
After the laminate is fixed to the support so that both ends thereof protrude, the through-hole into which the cylindrical bond magnet is inserted is connected to the notch so that a part of the inner wall is connected to the notch. And a fifth step of forming the central portion along the axial direction of the magnetic coil.   The method for manufacturing a magnetized coil according to claim 5, wherein the third step includes a step of inserting an insulating plate material into the cutout portion.   The method for manufacturing a magnetized coil according to claim 5 or 6, wherein the fourth step includes a step of electrically connecting with solder or a conductive wire.

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